(a) Displacement. A nonconforming use shall not be physically expanded or extended to displace a conforming use.
(b) Expansions, Extensions, or Enlargements.
(1) Expansions or extensions of nonconforming uses shall be limited to fifty-one (51) percent of the lot coverage of the structure or use at the time it became a legal, nonconforming use. An exception may be allowed by the Board of Zoning Appeals when the nonconformity advances a reasonable public purpose. For example, a legal, nonconforming restaurant may be expanded or extended when it is in the public interest to allow the facility to be enlarged to install public restrooms.
(2) If a structure is nonconforming due to a yard setback or height requirement, the structure may be expanded or extended provided it does not increase the nonconformity of the previously established setback requirement. For example, if a structure is nonconforming due to a front yard setback, the structure may be enlarged only to the extent that the previously established front yard setback is not further reduced.